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  4. The velocity of electromagnetic wave is parallel to :-

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Q. The velocity of electromagnetic wave is parallel to :-

AIPMTAIPMT 2002Electromagnetic Waves

Solution:

According to poynting theorem, direction of wave is given by:
$\hat{ S }=\hat{ E } \times \hat{ B }$
or velocity of em wave is parallel to $\vec{E} \times \vec{B}$